package org.apache.maven.repository;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.ArrayList;
import java.util.Collection;

/**
 * This is the main graph data structure used by the RepositorySystem to present tree and graph
 * objects.
 *
 * @author Oleg Gusakov
 *
 */
public class MetadataGraph {
  /** all graph nodes */
  Collection<MetadataGraphNode> nodes;

  /** entry point for tree-like structures */
  MetadataGraphNode entry;

  public MetadataGraph(MetadataGraphNode entry) {
    this();

    this.entry = entry;
  }

  public MetadataGraph() {
    nodes = new ArrayList<MetadataGraphNode>(64);
  }

  public void addNode(MetadataGraphNode node) {
    nodes.add(node);
  }

  /**
   * find a node by the GAV (metadata)
   *
   * @param md
   * @return
   */
  public MetadataGraphNode findNode(MavenArtifactMetadata md) {
    for (MetadataGraphNode mgn : nodes) {
      if (mgn.metadata.equals(md)) {
        return mgn;
      }
    }

    MetadataGraphNode node = new MetadataGraphNode(md);
    addNode(node);
    return node;
  }

  /**
   * getter
   *
   * @return
   */
  public MetadataGraphNode getEntry() {
    return entry;
  }

  /**
   * getter
   *
   * @return
   */
  public Collection<MetadataGraphNode> getNodes() {
    return nodes;
  }
}
